CN1237685C

CN1237685C - Insulating cover and electric machine

Info

Publication number: CN1237685C
Application number: CN 00818678
Authority: CN
Inventors: E·罗卡托马佐拉; T·希尔丁格
Original assignee: Siemens Ltda
Current assignee: Woith SIEMENS Hydro Power Co Ltd
Priority date: 2000-01-27
Filing date: 2000-08-04
Publication date: 2006-01-18
Anticipated expiration: 2020-08-04
Also published as: ES2261217T3; WO2001056135A1; DE60026141T2; NO20023587D0; NO20023587L; EP1250747B1; EP1250747A1; DK1250747T3; CA2398384C; DE60026141D1; CN1433586A; CA2398384A1; NO324855B1; BR0000189A

Abstract

The present invention describes an insulating cover (1), which is applicable to the statoric bars of large size electric machines. The objective of the present invention is to provide an insulating cover (1) that dispenses the use of resin for its fixation and enabling the checking of the conservation state of the end portions of the winding along the electric machine working life. This objective is achieved by means of an insulating cover for statoric bars of electric machines, the cover (1) comprising first (10) and second (20) faces positioned substantially parallel to each other and joined by at least one joining element (15) located in a substantially central portion of the faces (10) and (20), the element (15) being provided with at least one fixing means (17) to fix the insulation cover (1) to an end portion (29) of the winding of the electric machine.

Description

A kind of insulating lid and a kind of motor

Technical field

The present invention relates to a kind of electric insulation lid, be particularly useful for for example electric insulation lid of the stator bar of hydraulic generator of large-size machine.As seen, the invention still further relates to a kind of motor that is provided with this insulating lid.

Large-size machine is made of rotor and stator basically, and wherein these parts have winding, and winding is mainly become by the line clavate that is welded to one another, so that substitute the winding on the micro-machine that adopts lead to come the described parts of body plan.

Particularly, stator bar is connected with each other, and forms imbricate or wavy winding, and this depends on the scheme that is used for its manufacturing.Described connection is made by welding, to guarantee the circuit conductibility, because their outside exposes in motor side, therefore isolates from the rear portion.

Background technology

Now, the insulation of motor outside realizes that by insulating lid is set insulating lid is to utilize resin to be fixed on the line rod terminal.Described lid roughly is flat parallelepiped-shaped, and an one less face has opening so that be bonded on the outside of stator bar, thus they can by from the rear portion potting resin so that this lid is fixed on the line rod.

But adopt described lid to have some shortcomings, these shortcomings have increased the time and the cost of the manufacturing and the maintenance of present known motor.

In the shortcoming of existing insulating lid, low heat transmission is separately a significant problem, this be because in the normal course of operation of motor the circulation of electric current and welding be positioned at winding bar terminal place can cause one the zone of heat occur, utilize existing lid difficult heat transfer can occur, because directly do not ventilate in the contact zone.

Because used resin in the lid filler, the position of filling can be very dirty, this need carry out careful cleaning after finishing this work, thereby has caused quite long installation time.In addition, the top that lid is installed to motor becomes very difficult, because in such installation, the resin that remains liquid in the insulating lid can flow along winding bar after lid is mounted.

Owing to used resin, just must use other separately protected device (IPE).

And,, just can not directly check in the whole working life of motor that this is because these terminals are surrounded by resin to winding bar because adopted present lid.

Summary of the invention

The purpose of this invention is to provide a kind of insulating lid, it need not adopt resin to fix; By directly being ventilated, winding overhang has high heat transmission; Install easily; Safeguard and change the device that do not need protection, and during the working life of motor, can check the maintenance status of winding overhang.

This purpose is to realize by the insulating lid of the stator bar of a kind of insulating lid, especially a kind of motor, described lid comprises first and second, two face positions are parallel to each other and interconnect by at least one at least one Connection Element that is positioned at described middle part, and described Connection Element is provided with at least one fixture, insulating lid is fixed to the outside of motor windings.

Another object of the present invention provides a kind of motor that is provided with insulating lid, and described insulating lid need not adopt resin to fix; Install easily; Safeguarding and changing does not need to adopt protective device, and can check the maintenance status of rotor tip during the working life of motor.

This purpose is to realize by the motor with the insulating lid that is located at the stator bar outside, this insulating lid has first and second, two faces are parallel to each other and interconnect by at least one Connection Element that is located at described middle part, and described Connection Element is provided with at least one fixture insulating lid is fixed to described end.

Description of drawings

Referring now to the present invention being described in more detail with the embodiment shown in the accompanying drawing.

Fig. 1 shows the top view of insulating lid of the present invention;

Fig. 2 shows the end view of the insulating lid of Fig. 1;

Fig. 3 shows the side perspective view of the insulating lid among Fig. 1 and Fig. 2;

Fig. 4 is the end view of the insulating lid shown in the top figure, illustrates the end that it is installed to motor windings with part section.

Embodiment

As Fig. 1,2,3, shown in 4, insulating lid 1 (being object of the present invention) is formed by the main part 2 on the end 29 that will join a motor windings (not shown) to.

Main part 2 comprises first 10 and second 20, two faces roughly are rectangles and flat, they are arranged in parallel, and it is continuous by Connection Element 15 in approximate mid-section, element 15 determines in a face plane orthogonal with first 10 and second 20 place, it also be rectangle and be flat.

As shown in Figure 3, have favorable mechanical stability in order to make first 10 and second 20, and can be around element 15 bendings, its at least one end connects by gulde edge 30.Preferably use a pair of gulde edge 30 in the relative end of main part 2.

Connection Element 15 is provided with at least one fixture 17, insulating lid 1 is fixed to the end 29 of motor windings.Fixture 17 is a hole 18 preferably, is more preferably pair of holes, so that can insulating lid 1 be fixed to end 29 by screw 19.Obviously, the fixed form of Connection Element 15 can change, and also can adopt other fixture 17 without screw 19.Connection Element 15 also can be made with different modes, and for example two rectangle expandable parts that are arranged side by side can be fixed on insulating lid 1 on the end 29 equally.Also can use a screw 19 at the middle part of Connection Element 15.The fixing of insulating lid 1 also can in this case, must be predicted accurate size by engaging realization with end 29, and be fixing fully to guarantee.

As shown in Figure 4, the end 29 of motor windings will be introduced in the zone that limits by between first 10 and second 20, Connection Element 15 and the gulde edge 30.Then by screw 19 that insulating lid 1 is fixing, screw passes hole 18.In the present embodiment, 29 planted agents are provided with the threaded hole 16 that is used for twisting screw 19 in the end.

The size of insulating lid 1 should be enough big, so that engage with end 29 and seamlessly cooperate.Insulating lid 1 is preferably made by a blank, preferably forms by glass fibre is molded.This fiber also can be replaced by other material that can satisfy same mechanical and electrical insulation characteristics requirement, and has high resistance and high medium rigidity horizontal and vertical, and can also stand at least 155 ℃ temperature, to meet the requirement of F level.

A major advantage of comparing with the insulating lid of existing known technology is; the invention provides better heat transmission between end 29 and the external environment; in motor, produce less loss; and efficient is higher; reduced in the large-size machine installation process use to resin; reduce the dirt of service position; and installing in the process of insulating lid 1 not need be with independent protection equipment (IPE); reduced the set-up time of insulating lid 1; allow in addition the end 29 of motor is directly detected; this makes during shutdown is safeguarded after certain running time; the inspection personnel can detect the state of welding and terminal, and the installation and maintenance expense that has reduced insulating lid 1 significantly and be provided with the motor of this insulating lid 1.

Here described a preferred embodiment, should be understood that scope of the present invention also comprises other modification, it is only limited by the content of appended claims, comprises possible equivalents.

Claims

1, a kind of insulating lid (1) that is used for the stator bar of motor, it is characterized in that, it comprises first (10) and second (20), they are arranged in parallel and are connected by at least one Connection Element (15) that is located at first (10) and second (20) middle part, Connection Element (15) is provided with at least one fixture (17), so that insulating lid (1) is fixed to the end (29) of motor windings.

2, insulating lid according to claim 1 is characterized in that, described Connection Element (15) is positioned to the planar quadrature with first (10) and second (20) place.

3, insulating lid according to claim 1 and 2 is characterized in that, the end of winding (29) are introduced in the zone that limits between first (10) and second (20) and the Connection Element (15).

4, insulating lid according to claim 1 and 2, it is characterized in that, fixture (17) is provided in a side of the hole (18) in the Connection Element (15), and the end (29) that insulating lid is fixed to motor windings is to finish by at least one retaining element that passes hole (18).

5, insulating lid according to claim 4 is characterized in that, fixture is screw (19).

6, insulating lid according to claim 1 and 2 is characterized in that, described first (10) and second (20) and Connection Element (15) are the planes.

7, insulating lid according to claim 6 is characterized in that, described first (10) and second (20) and Connection Element (15) are rectangles.

8, insulating lid according to claim 1 and 2 is characterized in that, at least one end of each first (10) and second (20) is connected by gulde edge (30).

9, insulating lid according to claim 8 is characterized in that, gulde edge (30) engages with the end (29) of motor windings.

10, insulating lid according to claim 1 and 2 is characterized in that, described insulating lid is to be made by the glass fibre of die casting.

11, a kind of motor that comprises stator bar, it is characterized in that, the end of stator bar (29) is provided with insulating lid (1), insulating lid has first (10) and second (20), be parallel to each other location and be connected of these two faces by at least one Connection Element (15) of being located in the middle part of first (10) and second (20), described Connection Element (15) is provided with at least one fixture (17), so that insulating lid (1) is fixed to end (29).

12, motor according to claim 11 is characterized in that, the end of winding (29) are insulated lid (1) and surround.

13, motor according to claim 12 is characterized in that, end (29) are introduced into the zone that limits between first (10) and second (20) of insulating lid (1) and the Connection Element (15).